Those look pretty good to me, at least. Worst one of the bunch is 5, and even it's not terrible. That light tan color is what you want to see, and your center / side electrodes don't look bad, either (you don't want to see those too worn away / damaged; you'll have a little bit of wear in 100K mi, to be sure)
Make sure you replace them w/ the ACDelco iridiums (41-103, IIRC) - and do *not* gap the plug - they're pre-gapped, and you can easily damage / break the iridium electrode if you try adjusting the gap. FWIW, I checked the gap on all eight of my 110s, and all eight were on the money.
A little anti-seize on the threads would be good, and if you've got a torque wrench, I'm pretty sure they go in at 13 ft/lb on the 4200.
Keep an eye on #5 going forward - the cowl drips water right on top of it, and it can cause problems when water collects in the plug well.